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DESCRIPTION JP2000188797

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DESCRIPTION JP2000188797
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker suitable for application to a small speaker.
[0002]
2. Description of the Related Art Conventionally, a small speaker as shown in FIG. 6 has been
proposed. As shown in FIG. 6, this speaker has a ring magnet 1 in which N and S poles are
magnetized in the vertical direction, a ring plate 2 mounted so as to sandwich the ring magnet 1,
a center pole 3a and a flange A yoke 3 integrally formed with 3b is provided, and a magnetic gap
4 is formed between the inner peripheral surface of the plate 2 and the outer peripheral surface
of the center pole 3a of the yoke 3.
[0003]
A speaker frame 5 is attached to the plate 2, an edge 7 is provided on the outer peripheral
portion of the diaphragm 6, and the outer peripheral portion of the conical diaphragm 6 is held
by the frame 5 by the edge 7. 8はガスケットである。
[0004]
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1
On the other hand, a voice coil bobbin 9 is attached to the inner peripheral portion of the
diaphragm 6, and a voice coil 10 is wound around the voice coil bobbin 9. The voice coil 10 is
formed by the plate 2 and the center pole 3a of the yoke 3. The magnetic gap 4 is inserted.
[0005]
Further, in FIG. 6, reference numeral 11 denotes a damper for holding the voice coil 10 in the
magnetic gap 4.
As the damper 11, for example, a spiral damper in which a cloth is impregnated with a synthetic
resin is used.
[0006]
Reference numeral 12 denotes an input terminal, and an acoustic signal from the input terminal
12 is supplied to the voice coil 10 through the tinsel wire 13. Reference numeral 14 denotes a
dust intrusion preventing cap which covers the upper surface of the voice coil bobbin 9.
[0007]
In the speaker as shown in FIG. 6, the ring-shaped magnet 1 → plate 2 → magnetic air gap 4 →
center pole 3a of the yoke 3 → flange 3b → ring-shaped magnet 1 constitutes a magnetic circuit.
Since the polarity is different from that of the flange 3b of the yoke 3, a magnetic flux directly
flows from the plate 2 to the flange 3b of the yoke 3 to generate a leakage flux, and the
diaphragm 6 made about 1/3 of the magnetic force of the ring magnet 1 There was a
disadvantage that I did not use to drive.
[0008]
A speaker using a cancel magnet as shown in FIG. 7 has been proposed as a speaker in which
such a leakage flux is eliminated.
The parts corresponding to those in FIG. 6 will be assigned the same reference numerals as those
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2
in FIG.
[0009]
In FIG. 7, a ring-shaped cancel magnet 15 magnetized in the opposite direction to the ringshaped magnet 1 for main drive is attached near the lower surface outer periphery of the flange
3b of the yoke 3 in FIG. A bottomed cylindrical shield cover 16 is attached so as to cover the
magnet 15 so as to eliminate the leakage flux. Others are configured in the same manner as in
FIG.
[0010]
Such a speaker as shown in FIG. 7 requires a cancel magnet 15 in order to obtain a magnetic
shield type, and the cancel magnet 15 has a reverse polarity to that of the main ring-shaped
magnet 1. It is necessary to magnetize it and bond it to the rear face of this main ring-shaped
magnet 1, and also to provide a magnetic shield cover 16. The magnetic circuit configuration
becomes large and the magnetic shield type speaker diaphragm 6 is driven. There is a
disadvantage that the magnetic force (magnetic flux) of the air gap 4 does not increase so much,
for example, by about 10% and the magnetic force of the cancel magnet 15 is not used for
driving the diaphragm 6 at all.
[0011]
In view of such a point, the present invention proposes a speaker in which a magnetic shield type
speaker is obtained with a simple configuration and the magnetic force (magnetic flux) of the
magnetic gap for driving the diaphragm is increased. is there.
[0012]
SUMMARY OF THE INVENTION A loudspeaker according to the present invention comprises a
wedge-shaped yoke, a magnet disposed on the bottom of the wedge-shaped yoke, and a yoke
integrally formed with a center pole and a flange disposed on the magnet. A ring-shaped magnet
magnetized in a direction opposite to that of the magnet disposed on the flange of the yoke, and
a magnetic gap formed between the inner circumferential surface and the outer circumferential
surface of the center pole on the ring-shaped magnet And a plate disposed such that the outer
peripheral edge abuts against the upper end of the wedge-shaped yoke, and the magnetic gap
drives the diaphragm.
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3
[0013]
According to the present invention, the magnetic flux from the respective N poles of the magnet
and the ring magnet passes through the plate, the wedge-shaped yoke, and the yoke integrally
formed with the center pole and the flange to obtain the magnet and the ring magnet Since the
magnetic circuit to be returned to the respective S poles of is formed, it is possible to obtain a
magnetically shielded speaker with a simple configuration.
[0014]
Further, according to the present invention, since the diaphragm is driven by the magnetic gap in
which the leakage flux is reduced and the magnetic flux from the two magnets flows in the same
direction, the magnetic force for driving the diaphragm is increased. Thus, it is possible to
improve the sensitivity and the sound quality, to reduce the resonance sharpness Q at the lowest
resonance frequency of the bass of the speaker, and to obtain a speaker device capable of
expanding the bass reproduction band when using a small speaker box.
[0015]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the speaker
according to the present invention will be described below with reference to FIG.
In FIG. 1, parts corresponding to FIG. 6 are given the same reference numerals.
[0016]
In the example shown in FIG. 1, a ring-shaped magnet 21 having a diameter smaller than the
inner diameter of the wedge-shaped yoke 20 is magnetized on the bottom 20a of the wedgeshaped yoke 20 of a predetermined size. Adhesive bonding is performed so that the N pole abuts
on the bottom 20 a of the wedge-shaped yoke 20.
[0017]
The bottom surface of the flange 22b of the yoke 22 integrally formed with the center pole 22a
and the flange 22b on the S pole of the ring magnet 21 is adhered and fixed so as to abut on the
S pole of the ring magnet 21.
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In this case, the outer diameter of the flange 22 b of the yoke 22 is slightly smaller than the
outer diameter of the ring-shaped magnet 21.
[0018]
A ring magnet 23 in which N and S poles are magnetized in the vertical direction is adhered and
fixed onto the flange 22b of the yoke 22 so that the S pole abuts on the flange 22b.
In this case, the center pole 22a of the yoke 22 penetrates the ring-shaped magnet 23.
The ring-shaped magnet 23 has substantially the same shape as the ring-shaped magnet 21 and
has substantially the same magnetic intensity.
Further, in this example, the ring-shaped magnet 23 and the ring-shaped magnet 21 are
magnetized in opposite directions to each other.
[0019]
A ring-shaped plate 24 is bonded and fixed onto the N pole of the ring-shaped magnet 23, and a
magnetic gap 25 is formed between the inner peripheral surface of the plate 24 and the outer
peripheral surface of the center pole 22a of the yoke 22. The outer peripheral edge of the plate
24 is adhesively fixed on the circular upper end surface of the side wall 20b of the wedge-shaped
yoke 20.
[0020]
Further, the frame 5 of the speaker is attached to the upper surface of the plate 24, and the outer
peripheral portion of the cone-shaped diaphragm 6 provided with the edge 7 on the outer
peripheral portion thereof is held by the gasket 8.
[0021]
On the other hand, a voice coil bobbin 9 is attached to the inner peripheral portion of the
diaphragm 6, a voice coil 10 is wound around the voice coil bobbin 9, and the voice coil 10 is
inserted into the magnetic gap 25.
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5
[0022]
In this example, the magnetic flux from the N pole of the ring magnet 23 is the N pole of the ring
magnet 23 → plate 24 → magnetic air gap 25 → center pole 22 a of the yoke 22 → flange 22 b
→ S pole of the ring magnet 23 Flow through the magnetic circuit.
[0023]
The magnetic flux from the N pole of the ring magnet 21 is: N pole of the ring magnet 21 →
bottom portion 20a of the yoke 20 → side wall 20b → plate 24 → magnetic gap 25 → center
pole 22a of the yoke 22 → flange 22b → It flows in the magnetic circuit of the S pole of the ringshaped magnet 21.
[0024]
Accordingly, the magnetic flux in the same direction from the two ring magnets 21 and 23 flows
in the magnetic gap 25, and the magnetic force (magnetic flux) of the magnetic gap 25 increases.
Further, in this case, the ring-shaped magnet 21 constitutes a cancel magnet.
[0025]
Also, the voice coil 10 is held by the damper 11 in the magnetic gap 25.
As the damper 11, for example, a spiral damper in which a cloth is impregnated with a synthetic
resin is used.
Further, a cap 14 for preventing dust intrusion is provided so as to cover the upper surface of the
voice coil bobbin 9.
Further, an acoustic signal from the input terminal 12 provided at a predetermined position of
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the plate 5 is supplied to the voice coil 10 through the tinsel wire 13.
[0026]
Since the present embodiment is configured as described above, the ring magnet 21 constitutes a
cancel magnet and the magnetic flux from the respective N poles of the ring magnets 21 and 23
integrally forms the plate 24, the center pole 22a and the flange 22b. The magnetic circuit which
takes also to the respective S poles of the ring-shaped magnets 21 and 23 through the yoke 22
and the wedge-shaped yoke 20 is configured, and a magnetic shield type speaker can be obtained
with a simple configuration.
[0027]
Further, according to this embodiment, the voice coil 10 for driving the diaphragm 6 is driven by
the magnetic gap 25 in which the leakage magnetic flux decreases and the magnetic flux of the
two ring magnets 21 and 23 flows in the same direction. Therefore, the magnetic force for
driving the voice coil 10 is increased, and the sensitivity and the sound quality are improved, and
the resonance acuity Q at the lowest resonance frequency of the speaker bass can be reduced,
and the bass when the small speaker box is used. A speaker device capable of expanding the
reproduction band can be obtained.
[0028]
2 to 5 show other examples of the embodiment of the speaker according to the present
invention.
In the description of FIGS. 2 to 5, the parts corresponding to the example of FIG. 1 are denoted
by the same reference numerals, and the detailed description thereof is omitted.
[0029]
In the example of FIG. 2, the ring-shaped magnet 21 of the example of FIG.
[0030]
That is, in the example of FIG. 2, a cylindrical magnet 26 having a diameter smaller than the
inner diameter of the wedge-shaped yoke 20 in which N and S poles are magnetized in the
vertical direction is placed on the bottom 20a of the wedge-shaped yoke 20 of a predetermined
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7
size. The adhesive is fixed so that the N pole abuts on the bottom 20 b of the wedge-shaped yoke
20.
[0031]
The bottom surface of the flange 22b of the yoke 22 integrally formed with the center pole 22a
and the flange 22b on the S pole of the cylindrical magnet 26 is adhered and fixed so as to abut
on the S pole of the cylindrical magnet 26.
In this case, the outer diameter of the flange 22 b of the yoke 22 is slightly smaller than the
outer diameter of the cylindrical magnet 26.
The other components in FIG. 2 are the same as those in FIG.
[0032]
In this example of FIG. 2, the magnetic flux from the N pole of the ring magnet 23 is the same as
in the example of FIG. 1, the N pole of the ring magnet 23 → plate 24 → magnetic air gap 25 →
center pole 22a of the yoke 22 → flange 22b → Flow through the magnetic circuit of the S pole
of the ring-shaped magnet 23.
[0033]
The magnetic flux from the N pole of the cylindrical magnet 26 is N pole of the cylindrical
magnet 26 → bottom portion 20a of the wedge shaped yoke 20 → side wall 20b → plate 24 →
magnetic gap 25 → center pole 22a of the yoke 22 → flange 22b → It flows in the magnetic
circuit of the S pole of the cylindrical magnet 26.
[0034]
Therefore, magnetic flux in the same direction from the ring-shaped magnet 23 and the
cylindrical magnet 26 flows in the magnetic gap 25, and the magnetic force (magnetic flux) of
the magnetic gap 25 increases.
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Further, in this case, the cylindrical magnet 26 constitutes a cancel magnet.
[0035]
From the above, it can be easily understood that the same function and effect as the example of
FIG. 1 can be obtained also in the example of FIG. 2.
[0036]
In the example of FIG. 3, the wedge-shaped yoke 20 of FIG. 1 is configured by a disk-shaped yoke
27 and a cylindrical yoke 28.
[0037]
That is, a tubular yoke 28 is formed by bonding and fixing a cylindrical yoke 28 of a
predetermined length so that the inner peripheral surface of the lower end abuts on the outer
peripheral surface of the disk-like yoke 27 of a predetermined size.
In the example shown in FIG. 3, a ring-shaped magnet 21 having an N pole and an S pole
magnetized in the vertical direction is bonded to the central portion on the disc shaped yoke 27
so that the N pole is in contact with the disc shaped yoke 27. Fix it.
In this case, the ring-shaped magnet 21 is positioned by the magnet guide 27 a provided on the
disk-shaped yoke 27.
[0038]
The bottom surface of the flange 22b of the yoke 22 integrally formed with the center pole 22a
and the flange 22b on the S pole of the ring magnet 21 is adhered and fixed so as to abut on the
S pole of the ring magnet 21.
[0039]
A ring magnet 23 in which N and S poles are magnetized in the vertical direction is adhered and
fixed onto the flange 22b of the yoke 22 so that the S pole abuts on the flange 22b.
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9
In this case, the ring-shaped magnet 23 has a substantially circular shape as the ring-shaped
magnet 21 and has substantially the same magnetic strength.
The ring-shaped magnet 23 and the ring-shaped magnet 21 are magnetized in opposite
directions to each other.
[0040]
A ring-shaped plate 24 is bonded and fixed onto the N pole of the ring-shaped magnet 23, and a
magnetic air gap 25 is formed between the inner peripheral surface of the plate 24 and the outer
peripheral surface of the yoke 22. The outer peripheral edge portion is adhesively fixed on the
circular upper end surface of the cylindrical yoke 28.
Others are configured in the same manner as in FIG.
[0041]
In this example of FIG. 3, the magnetic flux from the N pole of the ring magnet 23 is the same as
in the example of FIG. 1, the N pole of the ring magnet 23 → plate 24 → magnetic air gap 25 →
center pole 22a of the yoke 22 → flange 22b → Flow through the magnetic circuit of the S pole
of the ring-shaped magnet 23.
[0042]
Further, the magnetic flux from the N pole of the ring magnet 21 is N pole of the ring magnet 21
→ disc shaped yoke 27 → cylindrical yoke 28 → plate 24 → magnetic air gap 25 → center pole
22a of the yoke 22 → flange 22b → ring Flows through the magnetic circuit of the S pole of the
magnet 21.
[0043]
Therefore, the magnetic flux in the same direction from the two ring magnets 21 and 23 flows in
the magnetic gap 25, and the magnetic force (magnetic flux) of the magnetic gap 25 increases.
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10
Therefore, it can be easily understood that the same function and effect as those in FIG. 1 can be
obtained in the example in FIG. 3 as well.
[0044]
FIG. 4 shows an example in which a particularly small speaker is obtained. In the example shown
in FIG. 1, the frame 5 is extended to form a wedge-shaped frame 5a at the center of the frame 5
of the speaker.
[0045]
That is, in the example of FIG. 4, the frame 5 is extended at the center of the frame 5 of the
speaker to form a wedge-shaped yoke 5a of a predetermined size, and the vertical direction is
formed on the bottom 5aa of the wedge-shaped yoke 5a. A ring-shaped magnet 21 smaller in
diameter than the inner diameter of the wedge-shaped yoke 5a, of which N and S poles are
magnetized, is adhesively fixed so that the N pole abuts on the bottom 5aa of the wedge-shaped
yoke 5a.
[0046]
The bottom surface of the flange 22b of the yoke 22 integrally formed with the center pole 22a
and the flange 22b on the S pole of the ring magnet 21 is adhered and fixed so as to abut on the
S pole of the ring magnet.
In this case, the outer diameter of the flange 22 b of the yoke 22 is slightly smaller than the
outer diameter of the ring-shaped magnet 21.
[0047]
A ring-shaped magnet 23 in which N and S poles are magnetized in the vertical direction is
adhered and fixed onto the flange 22b of the yoke 22 so that the S pole abuts on the flange 22b.
In this case, the center pole 22 a of the yoke 22 penetrates the ring-shaped magnet 23.
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11
The ring-shaped magnet 23 has substantially the same shape as the ring-shaped magnet 21 and
has substantially the same magnetic strength.
Further, in this example, the ring-shaped magnet 23 and the ring-shaped magnet 21 are
magnetized in opposite directions to each other.
[0048]
A ring-shaped plate 24 is bonded and fixed onto the N pole of the ring-shaped magnet 23, and a
magnetic gap 25 is formed between the inner peripheral surface of the plate 24 and the outer
peripheral surface of the center pole 22a of the yoke 22. The outer peripheral surface of the
plate 24 is adhered and fixed so as to abut on the inner peripheral surface of the upper end
portion (boundary portion with the frame 5 of the speaker) of the side wall 5ab of the wedgeshaped yoke 5a.
[0049]
The outer peripheral portion of the cone-shaped diaphragm 6 provided with the edge 7 on the
outer peripheral portion of the frame 5 of the extension portion of the wedge-shaped yoke 5a is
held by the gasket 8.
On the other hand, a voice coil bobbin 9 is attached to the inner peripheral portion of the
diaphragm 6, the voice coil 10 is wound around the voice coil bobbin 9, and the voice coil 10 is
inserted into the magnetic gap 25.
Others are configured in the same manner as in FIG.
[0050]
In the example of FIG. 4, the magnetic flux from the N pole of the ring magnet 23 is the same as
the example of FIG. 1; the N pole of the ring magnet 23 → plate 24 → magnetic air gap 25 →
center pole 22a of the yoke 22 → flange 22b → The magnetic circuit of the S pole of the ring
magnet 23 flows, and the magnetic flux from the N pole of the ring magnet 21 is the N pole of
the ring magnet 21 → bottom 5 aa of the wedge shaped yoke 5 a → side wall 5 ab → plate 24 →
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12
The magnetic gap 25 → the center pole 22a of the yoke 22 → the flange 22b → the magnetic
circuit of the S pole of the ring magnet 21 flows.
[0051]
Therefore, the magnetic flux in the same direction from the two ring magnets 21 and 23 flows in
the magnetic gap 25, and the magnetic force (magnetic flux) of the magnetic gap 25 increases.
Further, in this case, the ring-shaped magnet 21 constitutes a cancel magnet.
[0052]
Therefore, in this example of FIG. 4 as well, it can be easily understood that the same function
and effect as the example of FIG. 1 can be obtained. Further, in the example of FIG. 4, the frame 5
of the speaker is extended to form a wedge-shaped yoke 5a and is of a magnetic shield type, so
that the magnetization due to the magnetic force of the frame 5 decreases and the magnetic
shielding in the speaker system becomes easy. .
[0053]
Further, in the example shown in FIG. 4, since the wedge-shaped yoke is formed by extending the
frame 5 of the speaker, the cost can be reduced accordingly.
[0054]
FIG. 5 shows an example in which the present invention is applied to a speaker using a
diaphragm for headphones, and this FIG. 5 example forms a wedge-shaped yoke 5a at the center
of the frame 5 of the speaker as in FIG. The magnetic circuit configuration is the same as the
example.
[0055]
That is, in the example of FIG. 5, the frame 5 is extended at the center of the frame 5 of the
speaker using the diaphragm to form a wedge-shaped yoke 5a of a predetermined size, and the
bottom 5aa of the wedge-shaped yoke 5a. A columnar magnet 26 having a diameter smaller than
the inner diameter of the wedge-shaped yoke 5a in which N and S poles are magnetized in the
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13
vertical direction is placed on the bottom 5aa of the wedge-shaped yoke 5a. Adhesively fix.
[0056]
The bottom surface of the flange 22b of the yoke 22 integrally formed with the center pole 22a
and the flange 22b is adhered and fixed on the S pole of the cylindrical magnet 26 so as to abut
on the S pole of the cylindrical magnet 26.
In this case, the outer diameter of the flange 22 b of the yoke 22 is slightly smaller than the
outer diameter of the cylindrical magnet 26.
[0057]
A ring magnet 23 in which N and S poles are magnetized in the vertical direction is adhered and
fixed onto the flange 22b of the yoke 22 so that the S pole abuts on the flange 22b.
In this case, the center pole 22 a of the yoke 22 penetrates the ring-shaped magnet 23.
Further, the ring-shaped magnet 23 has substantially the same magnetic strength as the
cylindrical magnet 26. The ring-shaped magnet 23 is magnetized in the direction opposite to that
of the cylindrical magnet 26.
[0058]
A ring-shaped plate 24 is bonded and fixed onto the N pole of the ring-shaped magnet 23, and a
magnetic gap 25 is formed between the inner peripheral surface of the plate 24 and the outer
peripheral surface of the center pole 22a of the yoke 22. The outer peripheral edge of the plate
24 is adhered and fixed so as to abut on the upper end of the wedge-shaped yoke 5a (the
boundary with the frame 5 of the speaker).
[0059]
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14
The free end of the edge portion 30b of the diaphragm 30 constituting the diaphragm is fixed to
the outer peripheral portion of the frame 5 of the extension portion of the wedge-shaped yoke 5a
by the diaphragm ring 33.
Further, the voice coil 10 fixed to the boundary between the dome portion 30 a and the edge
portion 30 b of the diaphragm 30 is inserted into the magnetic gap 25.
[0060]
In the example of FIG. 5, the magnetic flux from the N pole of the ring magnet 23 is the same as
the example of FIG. 2; N pole of the ring magnet 23 → plate 24 → magnetic air gap 25 → center
pole 22a of the yoke 22 → flange 22b → It flows in the magnetic circuit of the S pole of the ringshaped magnet 23.
[0061]
The magnetic flux from the N pole of the cylindrical magnet 26 is N pole of the cylindrical
magnet 26 → bottom 5 aa of the wedge-shaped yoke 5 a → side wall 5 ab → plate 24 →
magnetic air gap 25 → center pole 22 a of the yoke 22 → flange 22 b → It flows in the magnetic
circuit of the S pole of the cylindrical magnet 26.
[0062]
Therefore, magnetic flux in the same direction from the ring-shaped magnet 23 and the
cylindrical magnet 26 flows in the magnetic gap 25, and the magnetic force (magnetic flux) of
the magnetic gap 25 increases.
Also, in this case, the cylindrical magnet 26 constitutes a cancel magnet.
[0063]
Further, in the example of FIG. 5, a protector 31 having a predetermined number of openings 31
a is provided to cover the diaphragm 30.
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15
Reference numeral 32 denotes an air resistance material provided to cover the opening formed
in the frame 5. In the example of FIG. 5, the other parts are configured in the same manner as a
conventional headphone speaker.
[0064]
In this example of FIG. 5, since it is configured as described above, the same function and effect
as in the example of FIG. 1 can be obtained and the magnetic force of the magnetic gap 25 can
be increased, so that high frequency radiation can be facilitated. .
[0065]
Of course, the present invention is not limited to the above-described example, and various other
configurations can be adopted without departing from the scope of the present invention.
[0066]
According to the present invention, the magnetic flux from the respective N poles of the magnet
and the ring-shaped magnet passes through the plate, the wedge-shaped yoke, and the yoke
integrally formed with the center pole and the flange. Since the magnetic circuit that returns to
the respective S poles of the ring-shaped magnet is configured, a magnetically shielded speaker
can be obtained with a simple configuration.
[0067]
Further, according to the present invention, since the diaphragm is driven by the magnetic gap in
which the leakage flux is reduced and the magnetic flux from the two magnets flows in the same
direction, the magnetic force for driving the diaphragm is increased. As a result, the sensitivity
and the sound quality are improved, and the resonance sharpness Q at the lowest resonance
frequency of the bass of the speaker can be reduced, and a speaker apparatus capable of
expanding the bass reproduction band when using a small speaker box can be obtained.
12-04-2019
16
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